Measures to prevent crooked teeth in children are as follows: 1. Eat more tough foods, such as chewing beef jerky, to stimulate the full development of the jawbone through chewing, expand the length and width of the dental arch, and ensure that all teeth can be aligned. 2. Teach children not to repeatedly lick the newly erupted teeth with the tip of the tongue to prevent the position of permanent teeth that have not yet completed root development from being skewed. 3. 4.After removing the residual roots and crowns with poor prognosis, wear a gap retainer to maintain the arch length and prevent the neighboring teeth on both sides from moving to the gap side, which may lead to difficulty in eruption of permanent teeth.